Telegraph system.



- 'No.s1s,145. PATENTEDAPR.17,1906. I; M. J. CARPENTER. TELEGRAPH SYSTEM.

APPLICATION ILED JUNE 2.1905

'the telephone-transmitter T and acts as av UNITED STATES PATENT orrios.

MYRON J. CARPENTER, OF LA GRAQE,,.ILLINOIS.

' TELEGRAPH SYSTEMLLH:

Specification of Letters Patent.

Patented April 17,, 1906.

Application filed June 2,1905. Serial No. 263,377-

\ erence being had to the accompanying drawraga, which form part of this speclfication.

y invention relates to improvements in telegraph systems.

One of theobjects of my invention isto provide a system of telegraphy in the practics of which signals at the receiving end become audible only to the receiving operator, thereby avoiding annoyance to other persons not inured to the noise roduced by telegra h-sounders, and, furt' ermore, guarding against publicity by other operators overhearing and reading the signals, as when a sounder is used. 7

Another object of my invention is to provide a self-contained instrument to be used in connection with an ordinary telephoneline, by means of which Morse or other similar telegraph-signals maybe transmitted over said lines, thereby converting the telephone system into a telegraph system and using the two systems conjoint y and simultaneously. Other objects will become apparent to those skilled in the art from the description hereinafter. a

In the drawings, Figure 1 represents a teleraph and a telephone transmitter associated m operative relation as arranged in my system. Fig. 2 is a partly diagrammatic view of the instruments and circuits constituting a modified phase of my system.-

The same reference characters are used to indicate-like parts in both of the views.-

In Fig. 1 A is a support for the key K and medium for communicating the mechanical 'vibrations produced by the operation of the key to said transmitter. 7c is the lever of the telegraph-key, provided wi h a manipulatingbutton k. The anvil k of the key is adapted to receive the im act of the upper circuitclosin contact k 0 the key K. k is a metallic ase u on which the key-lever k is supported. In ig. 1 the telephone receiver and transmitter are arranged and adapted to be contained in the usual telephone-line circuit. The tele raph-key K, as shown in Fig. 1, is not intcnde to be included in any electric circuit ,whatever. The mechanical vibrations pro- ,duced by the manipulations of the key K are taken up and conducted to the telephonetransmitter by means of the intervening medium-the su port Aand these vibrations and those pro uced by the voice will be transmitted over the line quite independently of each other. I

In Fig. 2 the telegraph-key is in the local electric circuit with the carbon contact portions of the transmitter T.

The transmitter T is fixed to the base A by means of the screws or bolts t and t respec tively. An opening t", which may be of the character usually'employed for the reception of the mouthpiece t", is brought into actual contact with and closed by means of the base A, so as to shut out extraneous sounds, the transmitter, thereby taking up solely the vibr'ations of the base A, produced by the mechanical manipulation of the key K. When the key K is included in the local circuit, as shown in Fig. 2, the mechanical vibrations produced b the mani ulation of the key are transmitte through t e medium of the base A to the telephone-transmitter T and thereby to line just as they are when the local circuit is not openedand closed by the manipulation of the key, as in Fig. 1. The opening and closing of the primary circuit of the transmitter by the manipulation of the key produces electric impulses that intensify the effect produced by the mechanical operation of the key, and correspondin electric im ulses are transmitted to line, thereby pro ucing clear and distinct telegraphic characters.

T T is an ordinary telephone-transmitter.

l is an induction-coil which may be used or not, as desired, having a primary circuit 4. and a secondary circuit 'L.

R is the usual receiver in circuit.

B is a battery, the source of current for the primary'circuit of the transmitter, and S is a switch-provided with a switch-arm s, pivoted at s, and contacts s and s for the transmitter T and T, respectively.

As my system is shown in Fig. 2, the telegra h-key K is in the local electric circuit wit the contacts of the transmitter T.

The circuit 1 will now trace as follows: -from the battery B over the wire 4 to one terminal of the primary coil a, through the coil over the wire 5 to the screw t in the base of the key, from thence over the lever is to the screw and thence to the anvil of the key through the bolt t to one contact of the the secondary transmitter T, from thence over the wire 3 to the contact 8 through the switch-bar s, over the wire 3, back to the batteryB, thus completing the circuit through tie transmitter and through the telegraph-l'rey. It is evident that when the telegraph-key is manipulated the transmitter-T will take up the mechanical vibrations due to the manipulation of the key, and it will also produce a coacting effect in the secondary circuit,due to the opening and closing of the primary circuit by means of the key. The secondar circuit includes the Secondary induction-c011 1-, the wire 6, including the receiver R, connected to the line terminal 8, and the linewire 7 to'the terminal 9.

' In Fig. 1 the transmitter is simply attached to the base A, upon which the key K is mounted. The manipulation of the key will produce mechanical imparted to the transmitter through the medium of the support A, which are transmitted over the line to a distant telephone-receiver,

The signals mechanically produced by the telegraph: key of Fig. 1 may be distinctly heard in the telephone-receiver by persons using the line for telephone terfere with such the telegraph-key are not objectionable to produce so harsh parties conversing over the line and do not an effect as when the telegraph-key is contained in an electric circuit and the circuit is periodically broken thereby.

When the switch. 5' occupies the position shown, the system will transmit 0111 the mechanical and electrical vibrations ue to the manipulation of the telegraph-key K, and any extraneous sounds willnot affect the transmission thereof; The telegraph-signals pass over the line clear and undisturbed.

The switch S an ordinary telephone-circuit may be readily adapted for use in conjunctionwith' my instrument. The same swltchboardsand methods of switching the telephone circuits may be retained in connection with my system.

In Fig. 1 the telegraph-key is not included in an electric circult and its manipulations do not affect the local circuit, except through the instrumentality'oi the vibrations roduced byits mechanical manipulation, W 'ch are transmitted through themedium of'the part A, upon which the key and the transmitter are supported.

VVhen it is desired to use the system entirely for transmitting the human voice, this can be done by To bring it into operation, the switch-arm s is thrown into contact with the terminal 8 thereby quickly circuit.

vibrations that are purposes; butthey will not in-' conversation. The v1brations produced in this manner by means of nation of a telegraph-key,

illustrates a means whereby nutter, a support commdn to both adapted a source of e means of the transmitter T.

disconnecting the transmit ter T and connecting the transmitter T in receiving operator during the continuance of the conversation.

In hotellobbies, where there are usually a great many people congregated, my system is verydesirable. By its use the information coming over the telegraph-wires cannot be surreptitiously obtained by eavesdropping telegraphers. In places where it is desirable to produce no appreciably audible sounds of the telegraphic characters by the sending oper'ators key, as in the system shown in Fig. 2, it may be adjusted so that it will be susceptible of the very slightest movement and the circuit may be varied or mani ulated thereby instead of depending entire y upon the vibrations made by the mechanical operation of the key to be transmitted by the transmitter.

I have found'in practice that the system as it is illustrated in Fig. I is entirely satisfactory, and sound-vibrations made by the mechanical operation of the key in making the telegraph-signals when the transmitter is connected upon the same base, so as to directly receive the vibrations 'made thereby, maybe read at the distant end of the line by means of an ordinary telephone-receiver with as much clearness and ease as if a sounder were present at the receiving end.

- Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In a system of telegraphy, the combia telephone-transand arranged to communicate mechanically vibrations due to the manipulation of the telegraph-kc to the telephone-transmitter, 'ectric current, and a circuit in cluding said source of current, the key, and the transmitter in series, whereby saidtransmitter is responsive to the sound-vibrations and to the current variations produced by the manipulation of said key.

2. In a system of tel graphy, thecombination of a telegraph-key a telephone-transmitter, a support whereon said key and transmitter are arranged in common, said support closing the mouth of the transmitter, whereby said transmitter is made responsive only to vibrations produced by the manipulation of the key.

3. In a'system of telegraph the combination of'a telegraph-key, .andya telephonetiansmitter mounted upon a support. common to both,

. nutter,'whereby said transmitter is made and a closure for said trans- :0 being responsive to the manipulation of the key.

4. In a system of telegraphy, the combi- -nation of a telegraph-key and a telephone,-

transmitter mounted upon a support coinmon to both, an induction-coil, a source of electric current and acircuit including said source, key, I

circuit of an induction-coil, said transmitter the sound-vibrations and transmitter and the primary to the current variations produced by the manipulation of the said key.

In testimony that I claim the foregoing as as my own I affix mysignature in presence of two wltnesses.

- MYRON .r. CARPENTER In presence of Fenian BAIN, MARY F. ALLEN. 

